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TCP acknowledgement number

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An ACK number of $1000$ in TCP always means that

  1. $999$ bytes have been successfully received
  2. $1000$ bytes have been successfully received
  3. $1001$ bytes have been successfully received
  4. None of the above
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2 Answers

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ans-(D) is correct

as we know in case of TCP random initial sequence number is used for the first byte,so nothing can be said about that how much data has been reached at the receiver side .
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Since its not mentioned clearly the first sequence number so nothing can be said about the ACK 1000. Hence option D.

But if it mentioned that initial SEQ number being 0, it means that 1000 bytes have been recieved by sender (as seq number will be 0-999)
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